Abstract
Mechanical properties of steel cast centrifugally had been reported under the rotating conditions of G≦152, and in this paper the author has investigated the changes of them at G>152.
The results obtained should that the mechnical properties got worse in the range at G>171 of this investigation of G=152∼192.
The mechanical properties were improved on annealing by increasing the annealing time but they got down as well at G>171.
Moreover, by microscopical observation of the cross section of the test piece, it was found that the carbon segregated more by increasing the rotating speed of the mould.
It seems to be true that the inferior mechanical properties at G>171 (N>1700r.p.m.) might be due to the severe segregation of carbon and other elements mentioned above as well as in the last report1).
